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How do you turn on a circuit at night Answered

Can anyone tell me how to incorporate a "dusk to dawn" photocell to this circuithttp://www.satcure-focus.com/tutor/page11.htmIts a simple long life flashing LED circuit.I need to build a circuit that will blink 4 red led'sand use very low power so that the batteries can last a long time.I want it to come on at dark and off at light.I appreciate the help.